The program doesn't execute codes after getting user input - c++

Question

I'm trying to write some content to a file and print it to the console. However, when I execute the codes, the program stops executing the remaining codes after getting the user input. Here is the codes:
#include <iostream>
#include <fstream>
int main() {
std::cout << "Password management program: \n";
std::cout << "1. Save your password \n";
std::cout << "2. Read your password \n";
int userChoice;
std::cout << "Enter your choice: ";
std::cin >> userChoice;
// std::cout << "User choice is " << userChoice << "\n";
int arrSize;
char str[arrSize];
if (userChoice == 1) {
// create a file
std::fstream pwdFile;
// open the file & name it
pwdFile.open("pwd.dat", std::ios::out);
std::cout << "Enter number of characters for the password: \n";
std::cin >> arrSize;
std::cout << "Enter your password: ";
for (int i=0; i < arrSize; i++) {
std::cin >> str[i];
pwdFile << str[i];
}
pwdFile.close();
std::cout << "Wrote to the file! \n";
}
else {
std::cout << "Wrong choice. Please choose again. \n";
}
return 0;
}
Here is the result after running the whole program in the terminal
PS D:\_RMIT lectures\Advanced Programming Techniques\NewWorkspace\Tutorial3> g++ exercise1.cpp
PS D:\_RMIT lectures\Advanced Programming Techniques\NewWorkspace\Tutorial3> ./a.exe
Password management program:
1. Save your password
2. Read your password
Enter your choice: 1
PS D:\_RMIT lectures\Advanced Programming Techniques\NewWorkspace\Tutorial3>
I have researched in StackOverflow, but I can't still figure out what happened to my codes. What should I do?

Answer 1

char str[arrSize];
For char array, its length does not accept variable, you may consider using string str to complete your program.